Duraphat
High-Concentration Sodium Fluoride Dental Varnish for Caries Prevention
Quick Facts About Duraphat
Key Takeaways
- Duraphat is a high-concentration fluoride varnish (22,600 ppm) applied by dental professionals to prevent tooth decay in children and adults.
- It works by strengthening tooth enamel and promoting remineralisation of early carious lesions, reducing caries incidence by up to 46% according to systematic reviews.
- Application is quick and painless – the varnish is painted onto teeth and sets on contact with saliva, releasing fluoride over several hours.
- Do not eat solid food or brush teeth for four hours after application; routine treatments are typically every six months, or every three months for high-risk patients.
- Side effects are very rare but may include allergic reactions; the product contains allergens (geraniol, citronellol, benzyl alcohol) and latex in the tube packaging.
What Is Duraphat and What Is It Used For?
Duraphat is a sodium fluoride dental varnish containing 22.6 mg of fluoride per millilitre. It is applied to the teeth by a dentist or dental hygienist to prevent dental caries (tooth decay). The concentrated fluoride strengthens enamel and helps reverse early stages of demineralisation.
Dental caries remains one of the most prevalent chronic diseases worldwide, affecting an estimated 2.4 billion people according to the World Health Organization. Fluoride varnishes like Duraphat represent one of the most evidence-based preventive interventions available in modern dentistry. Duraphat was one of the first commercially available fluoride varnishes and has been in clinical use for over four decades, establishing an extensive track record of safety and efficacy.
The varnish is formulated as a brown-to-yellow opaque suspension that contains sodium fluoride dissolved in an alcohol-based natural resin matrix. When painted onto the tooth surface, it sets rapidly on contact with saliva, forming a thin film that adheres closely to the enamel. This allows the fluoride to be released gradually over several hours, providing sustained contact between the fluoride ions and the tooth surface. This prolonged exposure is far more effective at promoting remineralisation than brief fluoride rinses or applications.
Duraphat is used for the prevention of dental caries in both primary (deciduous or milk) teeth and permanent teeth. It is particularly valuable for patients who are at high risk of developing cavities, including young children, individuals with a history of recurrent caries, patients undergoing orthodontic treatment, those with reduced salivary flow (xerostomia), and elderly patients with exposed root surfaces. Many national dental health programmes around the world include fluoride varnish application as a core component of their caries prevention strategies.
The mechanism of action involves several complementary processes. Fluoride ions from the varnish are incorporated into the hydroxyapatite crystal structure of tooth enamel, forming fluorapatite, which is more resistant to acid dissolution than native enamel. Fluoride also inhibits bacterial enzymes involved in acid production, reduces the ability of cariogenic bacteria to adhere to tooth surfaces, and enhances the natural remineralisation process by attracting calcium and phosphate ions to areas of early demineralisation. Systematic reviews published in the Cochrane Database have confirmed that fluoride varnish reduces caries incidence in both primary and permanent teeth, with an average preventive fraction of approximately 43–46%.
What Should You Know Before Using Duraphat?
You should not use Duraphat if you are allergic to fluoride or any of its ingredients, if you have mouth ulcers, gum inflammation (gingivitis), or oral mucosal inflammation (stomatitis). The product tube contains latex and the flavouring contains several potential allergens.
Although Duraphat is applied by a dental professional under controlled conditions, it is important that both the patient and the clinician are aware of specific contraindications, warnings, and precautions before the treatment is carried out. Providing your dentist with a complete medical and allergy history is essential for safe use.
Contraindications
Do not use Duraphat if you have any of the following conditions:
- Allergy to fluoride or excipients: If you are allergic (hypersensitive) to sodium fluoride or any of the other ingredients in Duraphat, including the natural resin components (colophony, mastic, shellac) or the flavouring agents, the product should not be used.
- Mouth ulcers or wounds in the mouth: Open sores or ulcerative lesions in the oral cavity can increase systemic absorption of fluoride and cause irritation. Treatment should be postponed until the ulcers have healed.
- Gingivitis (gum inflammation): Active inflammation of the gums is a contraindication. The inflamed tissue may react adversely to the varnish components and allow greater fluoride absorption through the compromised mucosal barrier.
- Stomatitis (inflammation of the mouth): Generalised inflammation of the oral mucosa should be resolved before Duraphat is applied.
Warnings and Precautions
Several important warnings apply to the use of Duraphat:
- Empty stomach: Application of Duraphat to the entire dentition should not be performed on an empty stomach. Ensure that you or your child has eaten a meal before the appointment, especially if the varnish will be applied to all teeth. This helps minimise any risk associated with incidental fluoride ingestion.
- Latex content: The tube packaging material contains latex, which can cause serious allergic reactions in latex-sensitive individuals. If you have a known latex allergy, inform your dentist before treatment. The dentist should handle the product using appropriate precautions.
- Allergens in flavouring: The raspberry flavouring in Duraphat contains the allergens geraniol, citronellol, citral, benzyl benzoate, linalool, and benzyl alcohol. These substances may cause allergic reactions in sensitised individuals. If you have a history of fragrance allergy or contact dermatitis, discuss this with your dentist.
- Other fluoride products: Do not use high-dose fluoride preparations such as fluoride gels on the same day that Duraphat is applied. Fluoride tablet supplementation should be discontinued for several days after Duraphat application to avoid excessive fluoride intake.
Food and Drink
Ensure that you or your child has eaten before the appointment, particularly when Duraphat is to be applied to the full dentition. After application, avoid solid food for four hours to allow the varnish to remain in contact with the teeth and release fluoride effectively. You may drink water and other clear fluids during this period. Do not brush your teeth for at least four hours after treatment. Brushing too soon will remove the varnish prematurely and reduce its effectiveness.
Pregnancy and Breastfeeding
Due to insufficient safety data, the use of Duraphat is not recommended during pregnancy or breastfeeding. If you are pregnant, planning a pregnancy, or breastfeeding, inform your dentist before any fluoride varnish treatment. Your dentist will assess the individual benefit-risk ratio and may recommend alternative preventive strategies such as enhanced oral hygiene measures, dietary counselling, or lower-concentration fluoride products with better-established safety profiles during pregnancy.
Driving and Using Machines
Duraphat has no known effect on the ability to drive or operate machinery. You can resume all normal activities immediately after the dental appointment.
How Does Duraphat Interact with Other Products?
Duraphat should not be used on the same day as other high-dose fluoride products (such as fluoride gels). Fluoride supplement tablets should be stopped for several days after application. There are no significant systemic drug interactions because Duraphat is applied topically to the teeth.
Because Duraphat is applied topically to the teeth and is not absorbed systemically in clinically significant amounts when used correctly, the potential for drug–drug interactions is limited. However, interactions with other fluoride-containing products are clinically relevant because excessive total fluoride exposure can lead to adverse effects, particularly in children.
| Product | Type | Effect | Recommendation |
|---|---|---|---|
| High-dose fluoride gels (e.g. APF gel, stannous fluoride gel) | Fluoride overexposure | Excessive fluoride intake; risk of nausea and vomiting | Do not use on the same day as Duraphat |
| Fluoride supplement tablets (e.g. sodium fluoride tablets) | Fluoride overexposure | Cumulative fluoride dose may exceed safe daily limits | Discontinue for several days after Duraphat application |
| Fluoride mouth rinses (e.g. 0.2% sodium fluoride rinse) | Reduced varnish efficacy | May dissolve varnish prematurely if used too soon after application | Wait at least 4 hours before using any mouth rinse |
| Fluoridated toothpaste (standard 1,000–1,500 ppm) | Minimal interaction | Normal brushing may remove varnish if done too early | Wait at least 4 hours before brushing; resume normal use thereafter |
It is important to tell your dentist or doctor about any fluoride-containing products you or your child currently use, including prescription fluoride rinses, fluoride supplements, or high-fluoride toothpastes (such as 5,000 ppm prescription toothpastes). Your dental professional can then plan the timing and frequency of Duraphat applications to ensure that total fluoride exposure remains within safe limits.
For patients taking systemic medications, there are no known clinically significant interactions with Duraphat. The product is not absorbed into the bloodstream in amounts that would interfere with other medications. However, as with all dental treatments, always inform your dental team about all medications you are taking, including over-the-counter products and herbal supplements, to ensure comprehensive care.
What Is the Correct Dosage of Duraphat?
Your dentist applies Duraphat directly to your teeth. The dose depends on the type of teeth (primary or permanent) and ranges from 0.3 ml for primary teeth to 1.0 ml for a full permanent dentition. Treatment is typically repeated every six months, or every three months for high-risk patients.
Duraphat is always applied by a dental professional – it is not a product for home use. The dentist or dental hygienist will dry the tooth surfaces with an air syringe or cotton rolls, then apply the varnish using a small brush, cotton pledget, or applicator tip. The varnish sets rapidly on contact with saliva to form a thin, adherent film on the tooth surface. The entire application procedure typically takes only a few minutes.
Primary (Milk) Teeth
Children with Primary Dentition Only
Maximum single dose: 0.3 ml
This dose is appropriate for young children who have only their primary teeth (typically up to approximately age 6). The lower dose reflects the smaller tooth surface area and the need to minimise fluoride ingestion in young children, who are more likely to swallow residual varnish.
Mixed Dentition
Children with Both Primary and Permanent Teeth
Maximum single dose: 0.4 ml
During the mixed dentition stage (typically ages 6–12), children have both primary and permanent teeth present. The slightly higher dose accounts for the larger combined tooth surface area while still maintaining an appropriate safety margin for the child’s body weight.
Permanent Teeth
Adolescents and Adults with Full Permanent Dentition
Maximum single dose: 1.0 ml
For patients with a complete permanent dentition, up to 1.0 ml may be used per application. This is sufficient to coat all tooth surfaces in a typical adult mouth. For targeted application to specific high-risk areas (e.g. cervical margins, exposed root surfaces, or white-spot lesions around orthodontic brackets), smaller amounts may be used.
Treatment Frequency
For routine caries prevention, Duraphat is typically applied every six months, often coinciding with regular dental check-up appointments. However, your dentist may recommend more frequent applications (every three to four months) if you or your child is assessed as being at high risk of dental caries. High-risk factors include a history of multiple cavities, poor oral hygiene, high sugar diet, reduced salivary flow, ongoing orthodontic treatment, and exposed root surfaces.
International guidelines, including those from the American Dental Association (ADA) and the Scottish Dental Clinical Effectiveness Programme, support the use of fluoride varnish at least twice yearly for children from the time the first teeth erupt, with increased frequency for those at elevated risk.
Overdose
It is very unlikely that an overdose of Duraphat would occur, as the product is always applied by a dental professional in a controlled clinical setting. However, if an excessive amount is accidentally swallowed – for example, if a child gains access to an unattended tube – contact your doctor, hospital emergency department, or poison control centre immediately. Symptoms of fluoride overdose may include nausea, vomiting, abdominal pain, and in severe cases, electrolyte disturbances. Management is primarily supportive and may include administration of calcium-containing solutions to bind free fluoride in the gastrointestinal tract.
What Are the Side Effects of Duraphat?
Side effects of Duraphat are very rare. The most serious potential reaction is angioedema (swelling of the face, lips, tongue, or throat). Other very rare side effects include oral swelling, inflammation of the oral mucosa, nausea, and skin irritation. Seek immediate medical attention if you experience difficulty breathing or swallowing after treatment.
Like all medicines, Duraphat can cause side effects, although not everybody experiences them. The overall safety profile of fluoride varnish is well established, and adverse events reported in clinical studies and post-marketing surveillance are rare. The most commonly reported issues are minor and transient, such as temporary tooth discolouration from the varnish film, which resolves when the varnish wears off or is brushed away.
- Swelling of the face, tongue, mouth, or throat
- Difficulty swallowing
- Hives (urticaria) and difficulty breathing
If these symptoms occur, remove the varnish immediately by brushing the teeth thoroughly and rinsing the mouth.
Very Rare
May affect up to 1 in 10,000 people
- Swelling in the mouth (oral oedema)
- Inflammation of the oral mucosa (stomatitis)
- Inflammation and ulceration of the gums
- Nausea and retching
- Skin irritation
- Angioedema (swelling of face, lips, tongue, mouth, or throat, sometimes with breathing or swallowing difficulties)
- Asthma attacks (in susceptible individuals)
Not Known
Frequency cannot be estimated from available data
- Hypersensitivity (allergic reaction)
It is worth noting that some patients may notice a temporary yellowish or brownish discolouration of the teeth immediately after Duraphat application. This is the colour of the varnish itself and is not a side effect – it is a normal cosmetic consequence of the treatment that fades over the following hours and days as the varnish gradually wears off. The varnish will not permanently stain the teeth.
The allergens present in the raspberry flavouring (geraniol, citronellol, citral, benzyl benzoate, linalool, and benzyl alcohol) are known sensitisers, particularly for individuals with existing fragrance allergies or eczema. If you have a history of contact allergy to cosmetic fragrances, inform your dentist before treatment so that a risk assessment can be performed.
If you experience any side effects not listed here, or if any effect becomes severe or persistent, contact your dentist or doctor. Reporting suspected side effects to your national pharmacovigilance authority (e.g. the MHRA in the United Kingdom, the FDA MedWatch programme in the United States, or the EMA in the European Union) helps ensure the ongoing monitoring of the medicine’s benefit–risk balance.
How Should You Store Duraphat?
Store Duraphat at or below 25°C (77°F), in a safe place out of the reach and sight of children. Use within three months of opening the tube. Do not use after the expiry date printed on the packaging.
Duraphat is typically stored and handled by the dental practice, but it is important to be aware of the correct storage conditions to ensure the product remains effective and safe:
- Temperature: Store at or below 25°C (77°F). Do not freeze. Exposure to excessive heat can alter the consistency of the varnish and may reduce its effectiveness.
- Keep out of reach of children: Due to the high fluoride concentration, accidental ingestion by a child could be harmful. The product should always be stored securely in a dental surgery or clinical setting.
- After opening: Once the tube has been opened, the contents should be used within three months. After this period, the product may have deteriorated in quality and should be discarded.
- Expiry date: Check the expiry date on the tube and outer packaging before each use. The expiry date refers to the last day of the stated month. Your dental professional will verify this before application.
Do not dispose of unused Duraphat by flushing it down the drain or placing it in household waste. Return any unused or expired product to your pharmacy or dental practice for proper disposal. This helps protect the environment from pharmaceutical contamination.
What Does Duraphat Contain?
Each millilitre of Duraphat dental suspension contains sodium fluoride equivalent to 22.6 mg of fluoride. The varnish also contains ethanol, natural waxes, resins (shellac and colophony), and raspberry flavouring. The tube material contains latex.
Active Ingredient
The active substance is sodium fluoride. Each millilitre of dental suspension contains sodium fluoride equivalent to 22.6 mg of fluoride (22,600 ppm). This high concentration distinguishes Duraphat from over-the-counter fluoride products such as toothpaste (typically 1,000–1,500 ppm) or mouth rinse (typically 225–900 ppm), and is the reason it must be applied by a dental professional.
Inactive Ingredients (Excipients)
The other ingredients are:
- Ethanol 96% – acts as a solvent for the resin matrix
- White wax (E901) – provides the varnish consistency
- Shellac (E904) – a natural resin that forms the adherent film on the tooth surface
- Colophony (rosin) – a natural resin that enhances adhesion; note that colophony is a known contact allergen in some individuals
- Mastic – a natural resin that contributes to the varnish texture
- Saccharin sodium (E954) – an artificial sweetener for taste
- Raspberry flavouring – containing the allergens geraniol, citronellol, citral, benzyl benzoate, linalool, and benzyl alcohol
Product Appearance and Packaging
Appearance: Duraphat dental suspension is a brown-to-yellow opaque suspension with a characteristic resinous odour.
Pack sizes:
- 1 × 10 ml tube
- 5 × 1.6 ml ampoules (unit-dose)
Not all pack sizes may be available in every country. The unit-dose ampoules are particularly useful in clinical settings as they reduce waste and simplify infection control procedures.
Manufacturer
Marketing authorisation holder: Colgate-Palmolive A/S, Copenhagen, Denmark.
Manufacturer: Pharbil Waltrop GmbH, Waltrop, Germany.
How Does Duraphat Work?
Duraphat works by depositing a concentrated reservoir of fluoride onto the tooth surface. The fluoride integrates into the enamel crystal structure, forming fluorapatite that is more resistant to acid attack. It also promotes remineralisation of early carious lesions and inhibits bacterial acid production in dental plaque.
The caries-preventive action of fluoride varnish operates through several well-established mechanisms that work synergistically to protect teeth:
Formation of fluorapatite: When fluoride ions from the varnish come into contact with the hydroxyapatite crystals that make up tooth enamel, they are incorporated into the crystal lattice, replacing hydroxyl groups. The resulting fluorapatite has a lower critical pH for dissolution (approximately 4.5 compared to 5.5 for hydroxyapatite), meaning that the enamel becomes significantly more resistant to the acid challenges produced by oral bacteria after consuming sugary or starchy foods.
Enhanced remineralisation: One of the most important functions of topical fluoride is its ability to promote the repair of early enamel lesions. When the tooth surface is exposed to bacterial acids, minerals (primarily calcium and phosphate) are lost from the subsurface enamel in a process called demineralisation. Fluoride ions in the oral environment act as a catalyst for remineralisation, attracting calcium and phosphate ions from saliva back into the damaged crystal structure. The remineralised enamel that forms in the presence of fluoride is actually harder and more acid-resistant than the original enamel.
Antibacterial effects: Fluoride has direct antimicrobial properties. At the concentrations achieved in dental plaque following varnish application, fluoride inhibits the enzyme enolase, which is essential for bacterial glycolysis (the metabolic pathway by which oral bacteria such as Streptococcus mutans ferment sugars to produce lactic acid). By reducing acid production, fluoride slows the rate of demineralisation. Fluoride also interferes with bacterial adhesion mechanisms, reducing the formation and virulence of dental plaque biofilm.
Calcium fluoride reservoir: When high-concentration fluoride products like Duraphat are applied, a layer of calcium fluoride globules forms on the tooth surface and within the plaque. This reservoir acts as a slow-release source of fluoride, providing ongoing protection between professional applications. The calcium fluoride dissolves gradually, particularly during acid attacks, releasing fluoride precisely when it is most needed to protect against demineralisation.
The evidence supporting the effectiveness of fluoride varnish is substantial. A 2013 Cochrane systematic review analysing 22 randomised controlled trials found that fluoride varnish significantly reduced caries in both primary teeth (preventive fraction 37%) and permanent teeth (preventive fraction 43%). More recent evidence continues to support these findings, with some studies reporting even higher efficacy when varnish is combined with other preventive measures such as oral health education and dietary advice.
Frequently Asked Questions About Duraphat
Duraphat is a professional-grade sodium fluoride dental varnish used to prevent dental caries (tooth decay). It is applied directly to the teeth by a dentist or dental hygienist. The high-concentration fluoride (22,600 ppm) strengthens tooth enamel and helps remineralise early cavities. It is used in both children and adults at high risk of caries, and is a core component of many national preventive dental health programmes.
For routine caries prevention, Duraphat is typically applied every six months. However, for patients at high risk of tooth decay, your dentist may recommend applications every three months. The frequency is determined by your individual risk assessment, which considers factors such as diet, oral hygiene habits, fluoride exposure from other sources, and history of cavities.
Yes, Duraphat is commonly used in children and is recommended by international dental organisations for caries prevention from the time the first teeth appear. The dose is carefully adjusted based on the child’s dentition: up to 0.3 ml for primary (milk) teeth, up to 0.4 ml for mixed dentition, and up to 1.0 ml for permanent teeth. A dental professional always applies it under controlled conditions, minimising the risk of excessive fluoride ingestion.
You should avoid eating solid food for four hours after Duraphat application to allow the varnish to adhere properly and release fluoride effectively. You may drink water and other clear liquids. Do not brush your teeth for at least four hours after treatment. It is recommended to eat a meal before the dental appointment, especially if the varnish is to be applied to all teeth.
The use of Duraphat during pregnancy and breastfeeding is not recommended due to insufficient safety data. If you are pregnant or breastfeeding, inform your dentist before any fluoride varnish treatment. Your dentist will assess the benefits and risks and may suggest alternative preventive measures such as improved oral hygiene, dietary modifications, and standard-strength fluoride toothpaste.
Duraphat may cause a temporary yellowish or brownish discolouration of the teeth immediately after application. This is the colour of the varnish itself and is completely normal. The discolouration is cosmetic, not a side effect, and fades over the following hours to days as the varnish wears off naturally or is removed by brushing. Duraphat does not permanently stain the teeth.
References
This article is based on the following international medical guidelines and peer-reviewed sources. All medical claims have evidence level 1A, the highest quality of evidence based on systematic reviews of randomised controlled trials.
- Marinho VCC, Worthington HV, Walsh T, Clarkson JE. Fluoride varnishes for preventing dental caries in children and adolescents. Cochrane Database of Systematic Reviews. 2013;(7):CD002279. doi:10.1002/14651858.CD002279.pub2
- World Health Organization (WHO). Ending childhood dental caries: WHO implementation manual. Geneva: WHO; 2019.
- American Dental Association (ADA) Council on Scientific Affairs. Topical fluoride for caries prevention: executive summary of the updated clinical recommendations and supporting systematic review. Journal of the American Dental Association. 2013;144(11):1279–1291.
- Weyant RJ, Tracy SL, Anselmo TT, et al. Topical fluoride for caries prevention. Journal of the American Dental Association. 2013;144(11):1279–1291.
- Scottish Dental Clinical Effectiveness Programme (SDCEP). Prevention and Management of Dental Caries in Children. Dundee: SDCEP; 2018.
- Public Health England. Delivering better oral health: an evidence-based toolkit for prevention. 3rd edition. London: PHE; 2021.
- European Medicines Agency (EMA). Duraphat – Summary of Product Characteristics. Accessed January 2026.
- Lenzi TL, Montagner AF, Soares FZM, de Oliveira Rocha R. Are topical fluorides effective for treating incipient carious lesions? A systematic review and meta-analysis. Journal of the American Dental Association. 2016;147(2):84–91.
Editorial Team
This article has been written and reviewed by the iMedic Medical Editorial Team, a group of licensed specialist physicians and dental professionals with expertise in preventive dentistry, paediatric dentistry, and oral public health.
Medical Writers
Board-certified physicians and dental professionals specialising in preventive dentistry and clinical pharmacology with documented academic and clinical experience.
Medical Reviewers
Independent review board ensuring clinical accuracy, adherence to international guidelines (WHO, ADA, FDI, Cochrane Oral Health), and evidence level 1A standards.
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